The Hot Seat exercise works your butt and legs. Do 2 sets of 12 reps on each leg.
Play Away the Pounds! Hot Seat: The key to this single-leg squat is to really press through your heel of your standing leg to get yourself up. Don't let momentum takes over. And if you want to make the move harder, barely let your butt brush the seat as you stand up again. You're gonna do 12 repetitions per leg.